
MCP has reached the PLC: how to connect an AI agent to a line so it reads data and a human approves changes
In 2026 Ignition, CODESYS and OPC UA gained MCP servers, and Rockwell and Siemens showed engineering agents. Here is a tested MCP server for a production line in Python: reads from a tag allow-list, setpoint changes only after a person approves, and where such a server belongs in a plant.
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